with \(C_0 = 0.81\times 10^{-6} \mbox{ m}\) , \(C_1 = 7.83\times 10^{-6} \mbox{ m}\)  and \(C_2 = -4.39\times 10^{-6} \mbox{ m}\) ; \(r=3.91\times 10^{-6} \mbox{ m}\)  is the large radius (details on the conversion between physical and lattice units are provided in [1]}, [2]}).
